Model of a ladder, Peter van der Loo, c. 1850 demonstration model Model of a ladder that can be used in three ways: as a few ladder, extended and as a scrap ladder. The extendable part, which must be extended by hand, has a wheel at the top of each leg. Two piles prevent it from moving back. At the top of the part are two hinges, the extendable part of which can be attached; If the bracket is subsequently detached, a scrap ladder is obtained. The Hague wood (plant material). brass (alloy)

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